Second level trigger of the L3 experiment. Part II. The event selection

被引：0
|
作者：
Beingessner, S.P. [1 ]
Blaising, J.J. [1 ]
Chollet-Leflour, F. [1 ]
Degre, A. [1 ]
Dromby, C. [1 ]
Forcorni, G. [1 ]
Goy, C. [1 ]
Lecoq, J. [1 ]
Morand, R. [1 ]
Moynot, M. [1 ]
Perrot, G. [1 ]
Rosier-Lees, S. [1 ]
机构：
[1] Lab d'Annecy-Le-Vieux de Physique, des Particules, Annecy-Le-Vieux, France
来源：
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 1994年 / A340卷 / 02期
关键词：
Codes (symbols) - Computer software - Data acquisition - FORTRAN (programming language) - Microprocessor chips - Signal filtering and prediction;
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摘要：
The events recorded by the L3 data acquisition system are selected by three levels of trigger. This paper describes the event filtering performed by software at the second trigger level. First coded off-line in FORTRAN, the filtering software is microcoded for on-line execution in a farm of 3 XOP processors operating in a round-robin mode. It identifies and rejects background events. Depending on running conditions and trigger type, rejection factors of 45-80% are obtained on first level energy, muon and TEC triggers. Selection efficiencies greater than 99.95% are achieved.
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页码：322 / 327
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